A text-book of entomology, including the anatomy, physiology, embryology and metamorphoses of insects, for use in agricultural and technical schools and colleges as well as by the working entomologist . iopods from which the Campodeae,Thysanura, and Collembola may have sprung. We are indebtedto Grassi for the first extended work on the morphology of Scolo-pendrella (1885). In 1886 he added to our knowledge factsregarding the internal anatomy, and gives a detailed comparisonwith the Thysanura, besides pointing out the resemblances of Scolo-pendrella to Pauropus, diplopods, chilopods, as well as
A text-book of entomology, including the anatomy, physiology, embryology and metamorphoses of insects, for use in agricultural and technical schools and colleges as well as by the working entomologist . iopods from which the Campodeae,Thysanura, and Collembola may have sprung. We are indebtedto Grassi for the first extended work on the morphology of Scolo-pendrella (1885). In 1886 he added to our knowledge factsregarding the internal anatomy, and gives a detailed comparisonwith the Thysanura, besides pointing out the resemblances of Scolo-pendrella to Pauropus, diplopods, chilopods, as well as Peripatus. In 1888 Grassi expressed his view as to the position of theSymphyla, stating that it should not be included in the Thysanura,since it evidently has myriopod characters; these being the supra-spinal vessel, the ventral position of the genital glands; the situa-tion of the genital opening in the fourth segment of the trunk, itsganglionic chain being like that of diplopods, its having limbs onall the segments, etc. On the other hand, Grassi has with muchdetail indicated the points of resemblance to the Thysanura. Theprincipal ones are the thin integument, the want of sympathetic st oe:v. FIG. 15. — Section of ScoIopendreJla • imm<tcnJ(tf(i: «?, oesophagus; oe. v, ossophageal valveentering the mid intestine (stomach) ; i, intestine ; r, rectum ; br, brain ; «*, abdominal chainof ganglia : <,/•</, oviduct; or, ovary ; *.!?, silk-gland, and op, its outer opening in cercus, w. t, uri-nary tube ; eg, coxal glands or blood-gills. — Author del. ganglia, the presence of a pair of cephalic stigmata, like that saidto occur in certain Collembola, and in the embryo of Apis; twoendoskeletal processes situated near the ventral fascia of the head;the epicranial suture also occurring in Thysanura, Collembola,Orthoptera, and other winged insects, and being absent in diplopodsand chilopods. He also adds that the digestive canal both inSymphyla and Thysanura is divided
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectinsects
